FriXion ink is a thermosensitive ink that can be erased by rubbing. Interestingly, erased ink reappears at temperatures below 14° F (-10° C). A freezer is cold enough to make this happen. It is like magic ink for adults! Due to the thermosensitive nature of FriXion ink, we advise against using it for mailings, or leaving the written materials in hot cars or in environments that expose them to a lot of friction.

Q: My Pilot FriXion pen is not writing well. It seems to be dried out or writing with clear ink. What should I do?The FriXion ink formula is thermo-sensitive, which causes it to become invisible when heat from friction is applied. If the pen has been exposed to warm temperatures or direct sunlight, this may have caused the ink inside the pen to be "erased." Please try to store the pens in your freezer overnight, then remove them for an hour or two prior to writing to allow them to come back to room temperature. This can usually reactivate the coloring in the ink and allow the pens to write as normal.